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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a879597c176df50820d5f270f97d367552c30e4b0d4bba6812ac0e59699fc04' 
  AND token = 'MxwWk+DOL9zOiXjaak7W7e38idz+U7FxP7/rEBNn7mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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