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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5954defb2a5287447f2d7d1a184dfff1505b21ebd20405efcb8a83be4ef67128' 
  AND token = 'Rh13SuMfo9x9yYWxg15AY8Hbom/sbxKEjoNTcGXMjUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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