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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7371279b01d6a03aa6d32e80c435794125275f854b770082f8c800e01801bb' 
  AND token = 'wf0nu/MiKnEbm11/Zlo4OsLas17Q6kRB8Z+TGcHHrpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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