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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cd8a611fdb5d8f1b6f244341a0140d6d1c87a8257a5c1c159b5a63c8d98107' 
  AND token = '/QUib8sMJ0CodUQlVahpX3xvSXzMZWRQZRXf/Co6A58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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