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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d204cb6c4849c23858d5ec9434a8a2f2eb79f2d7f43522f00b23f6bac515e9' 
  AND token = 'KpyePRiTEG+Ac6osBLlP4iMIjovVvEeqxfckJoUzsHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00239

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}