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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118cc00497938a59546fc1070c28d1b63dbd77cc6ca8614f8d41367586669b53' 
  AND token = 'p6vbW4d2Fe+Q31oF0lbl4SnM5XMKxQm/shG8J5M5r6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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