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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27aaf73e18abdad2209774831857b2a4474465f01ef02294324810dd0913b174' 
  AND token = 'LO2H31V2L/X+yUXeD9e0q6hUDdjguXxo3czh27+Mi9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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