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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cf24dcac05b7013b7e90c3e17c744d607f5d1a45311b3e22fde58e6e520ddfb' 
  AND token = 'yPapC2UBS0+qqIV6yazMVWOcWp/nxTgjTG+a4a13BIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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