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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ac4ee6edcab972903b3bd4367348b4097914e22e31d14282440c8907a75dca' 
  AND token = 'q61Uh2bX2qwTx09a4nrVkvFbZs7Ad8Y/laev1A/xU2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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