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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa869fea58906e71d5120aa9e4c6d890f5e891f69bb40782063301791244152' 
  AND token = 'eKK0aS3mpcQ7w9RP3fbkNr29u6f7KkwKk2FTE6SttK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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