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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7296fd76c7beebdd2f0e2063de519524023740768a470fe9830ab31e851008e8' 
  AND token = 'cJ86ncYqJAb5sZ7+kx8OgY3VNm1V/e1IZjc9FqqbDf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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