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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0061b02673165f08743cc33d618026e34c66c75bcb801428febec8da1b701279' 
  AND token = 'XqYhmIZtbrIecQRnO7rJlsAY6XC5G9iqY0c40P+LwDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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