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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3442a38ef254820fdcb164bfeb5841a1f4a9c479ad3016719b3a97e7960ae48' 
  AND token = 'Ar3nN0EFIl4L1RoxlBiqJ2AVdHzmzS0MZI5lRmYIiUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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