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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1487dbf18b9b10a98ec999b4407bccb568fe080f67f7396f30b323cc8c5caad9' 
  AND token = '/VxquaoR5cUMRPFwd5A+dv+L8j99KC3emmqO2JpgE2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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