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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c9c87c873dc00155c2236e6db9f36ff12ecc594f1a2e221a5db91ba1063312d' 
  AND token = 'QATrIzvJV8LT3zLDsk5qz2R6HSclcAfoUNg54zwXz6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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