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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c04fd792ee1f46fdded50f192fa2c922a9d4c0febbf93779e6a29060eb3922' 
  AND token = 'SeMKRbyyi1OyjWGW03+dLJrJ94DUe3bkibsWg/KwqHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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