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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9eff2b33912e704adc68ad843064069acb467cb3c9e5d78d9abbccfc9ba01d0' 
  AND token = 'eZO13Lc8nsDmfkNx6hVHCk5bSwxnL3mhGU7QSIC8m/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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