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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c52e7797f748a0d9198e9358e4b04c53d36469be25837f2742a3c70cfc5ba201' 
  AND token = 'sqdsfR7DmKLym0WMUYStCKbDPQR+5apVZikSxg7Mauk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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