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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6054beb0fd7b574e81d5d92d0c7587412f46fb4375ad213733c15a7f5ab9f773' 
  AND token = 'z6jJ1TQ9dx6asau1DKOreLPJWMCQoEtzxShzBPXevcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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