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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa6c2bc6e6438d46c02f834f2463e11075ee6833866c0600be5e4f8734c4a753' 
  AND token = '5h5lpNiFNUyhxC5DdSdOc4FZQZJ1udHroBXzTSZ6YWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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