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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbb767dff2534f784e79f3932d77df82ae3cfeb9e689a56d3695461e9fddfa5' 
  AND token = 'V6NFtvpwWzDUNSylGQHxwxHJDDSQl9u82ZlwEZpFxqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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