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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ada9fe6f77c73c0a09213ea060fcfe0ecf2f1f8293a9147ed04287bcdd6b82' 
  AND token = '8PJd7PGvGYHkNLQy4a784J34+BM5llFh8FAd0HuNb5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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