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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29e82a21de02e04145afdc2898f954fe36713208bf5182f3355ddd93cb090433' 
  AND token = 'YdL6PtENKxv9TRiR1BEgkcTlG33PChkUkV1/3pSflDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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