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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b09833144339400761c2db32f04f9bddd6e69bb0f13e6f5c9c31719dda8d85' 
  AND token = 'OCrxCiLAxzi/0QojwRipEaQvxALZUnaKqnZb5X0CaiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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