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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81164c264cd503933126a2aacb3ff028e4d0e16d7d05b6e80bde6d3fe056f70' 
  AND token = 'Sj4vHuuDavT6carRsuamEyg0ht9vNH7y2LJ7tyoCh+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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