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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ee32d71be6f87552c292ce48617ae68e78e390783f416aa0a0c75c6b197c00' 
  AND token = 'FL1srO+NKTJXO+03mBH6B/7BMt8NYoRpS9ai7DUKVLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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