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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73dcf6f0b7e0718af589c45cfcac9e29e4eeb26ac65c02e20d5238c50c36840' 
  AND token = 'AQI0GZ3KJ5Ys/WG37k1MtQ0xOnH5luG7bdFwvTHrkHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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