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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600c268aa0cee15b1913ee75f01d8766f705991ab9cc165acc3a0c994a042e1a' 
  AND token = 'lw8x0qC7mTk9aVUWsbjf82dJncs+25F6Dum7KPrzzHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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