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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96dd4dbd07d25adaa56f4d86be11110d216d26e9c45803590aa58c755205cbd' 
  AND token = 'CTmuATVMilQZMn6Q+WSZ/t8msHbRWFooTojWV23fOAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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