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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '435aa108ba38edded0a6b780bcd45bd5ffce55aa7b7a6308aeab103a9d5c24a4' 
  AND token = 'n24UYcvI6dBUaTSRhNoYzdz0d10ebqV6RF9+r2j3gg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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