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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e3cd240b3edbdd07ac0ca37fc8ab07a809eb24f065472d8984f30b6c1e92b3' 
  AND token = 'uSbg9bRmhbMyi/w7Frfu1pph1fu+XeGk7hW30wo4cz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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