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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aebddb0c8d654b04b7534b3852277d4020f63413e6974c2927cf3c18227aa96' 
  AND token = 'Pidxt5pRQjKArK48yc5+rdfGYGYWqEhTRvPL6KaAkAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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