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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e0a224b2602e76c9e3cee4e88e08eebed0f6f8d710cbcd428c9651ae606a9c' 
  AND token = 'mMF71bfPnrgE5B+nrgEc4Wl7Rop3wc24bIwU/bsY5MA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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