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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7026e054b05cc4239ab95ea39aa5065ee42f28dafc1ab4c1b21fe9999959c0' 
  AND token = 'GEuJzxNDb9Cy0gdM1OAQIELivvlpZM0sKNw1rtofdbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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