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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b11d8b156d52e37898af6a260074aad7f6a21d3786eb3a9699eeb5fa56796e' 
  AND token = 'NojhB1oyFI1GMe4BGiv6WhIQIIoZGuNZ9ApsjVQemx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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