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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3a8b5fd454565bef56b91952a6b481fab4f1ca9c5f33d0394fd0b853987e2e5' 
  AND token = 'hhfVIotdVcrUDZrPqAahJIfex6akrxWa+RsOTvhpF4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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