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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347b268faba91b386cafc4c599a5975f66487034f81af69dac080b5a645d2a0c' 
  AND token = '4RfcGbbs3BeMHsEYb/u8CkGAYJYLytKRG+J5dSYr5sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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