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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8103cbb5fcf6a0c944db94cb912feafbe4f13ffa59c2d513c0a5d8ee205d14f' 
  AND token = '8u2VxnJhfI2HkeJNfk5g0J7hNLXT7XBOtmQbCqDna2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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