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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828424fffd3ef4d9fc430440fcdb38b51760bb91243733a8eea28ecaf80f8fa6' 
  AND token = 'R/M+qnCU/Lul3pYr58+k7MFnKxUEcovuaC92f02xlx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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