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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a66e53ba15ed71d2ee3ed3459902ed1d385a448d60c4361f39b1261f3fd2d0' 
  AND token = 'Bcke1RvMv9seRE/9i8YDyKxOHA6ybjAPX6GvtoWsbTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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