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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3399f1d71a8d1055301806baf456689e042ca1510eb374cfebf68da046f42765' 
  AND token = 'S5wreIY94G6L1MJjO6lBdp8wX4+2EbO75s9skWSoYF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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