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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63623d340f0ec7bb9c75fb65a2f78f3db7284ac6d04b36ccd4bbff931d0a5af2' 
  AND token = 'Ljd4F+oB9Xuzb48QbRNuvkZmxppEBygJrE44XDsZFfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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