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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1db0fa4a5ca77f6c3f885cb36c291440a01f2812920a1f4a145f87dec39bac5c' 
  AND token = '48LDEnt5WL0co5JHiT34KAdph6VevJkqLZSE16K1fKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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