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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b99be4f95e87699d47cae9d0b5f5c68cf893c6d6b8fdb98ed2a8eaa3635b091' 
  AND token = 'LrI+HLnWYpXXGSdLJ+jNUdJzuq64tojDsb3mGVyOBI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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