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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af7ef861e90dcd8f35c6757f788de892a12e7046f79a325f08e149fd35056e5a' 
  AND token = 'B4LAA4f9RAVMa1maC+N452dZebQInTnp39y62/FpBks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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