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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d61525b432ae085eea2bbe261b1226a96c28a263d864438735acd6728d7b611' 
  AND token = 'FmNi3STrNzviVXMgYnDOgbOUjp6ZK6+9MpSlkWvD0HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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