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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90528b6486197c8c09270ec1ebf95a3e381e05efcee0cf516070e94b2b91aeb5' 
  AND token = 'qmF/GXWz+bNmvgMavheWWP4EWqT8RVCEE+oV1IIXsv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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