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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e4c3554dc811e9863331a1a40e984e467e65cd4ae4c4533e310edcab07a7ea3' 
  AND token = 'h0Vi9SMG6mfGI7/pVSSvrtODoNnGpP6BJVugIpgPREE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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