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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd603dcba93c49966317b11ee470756f82c2b2bae27b300fcce53cfed624d0936' 
  AND token = 'D+BCY5KC/xOkvXlxogCEMN9WdiROAD27329WwiS2C4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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