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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30b8d28f65b4b86717747cd461e72fd059e374e067e02ea42f9f4c64e6e203b4' 
  AND token = 'V4nZmskCnhkjPOS9BG8EoVNnRhNR3H5AMurb7mjRp0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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