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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ac83cb8188efe211f91c996f33bbc3700ced76d0ccb81be6326680635b2638f' 
  AND token = 'WRm0CV1hpjH6t+hHRXoBHI43Hb9Feg0vRX5Z5BHGnc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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