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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1d00e43795d3ea1a177f6777cef4b4691537aaeaf7c25bea2bf8055e531730' 
  AND token = 'kaqIeaxM8hXEfnrvQO5FQGMVyUypoLJm2nFd6ED9UXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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