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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee95e3f0eb33a8f3b2f7f650626c1427705dee7d67768d654c707388e78e7503' 
  AND token = 'EiGeV8VNloBfONTEjkXkFsF1Mhdf6Jo5n0bcyhqjQOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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