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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b2698b6316e7f1f152e28aeece9f0de647c786f05cd79ac98c46a694e3f55a' 
  AND token = 'Wpj77XQ74bTc4cUbKsT9wj02m1c5qWsYGnJB+9qwnTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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