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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0a0abbe642c48b82a042f7dd4b816ead7808fce5ca8fd9c2308d836d20ac2d' 
  AND token = 'U3EQrZZk3XAXHb+8qH7kSZ0pXccG+VgDiMqbFdImAPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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