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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d62b04cdd190eaf37f31d5330ddb480c7248341450a99af6d7dfe34b87d7173' 
  AND token = 'Tr3yJeGIujW1tsooi4wzFNLjJLs/dQw+0T7syhCAuTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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