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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ada9fb478f3be27a6d3601da53bd485144d3851212c9fe1c1d153553597cead' 
  AND token = 'fHR0L+OF9ChiJWkyy7cqbXfGNMHYUFasOQDvbO09lpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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