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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7f39181e5f89ab00785c156bb05a695c47b5ea50e2ae254b682c2c65197b26' 
  AND token = 'aKBq7aRQkpabongskmgxPQqCCu0AW85REc4E9Uz8zVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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