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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeb7f6238c41c81ebcbba9ede43f8e0bbf32abccfb652026c03d378486e2929c' 
  AND token = '+B8sCMA3th7w6NCTbmfs2sk0drmXAEe1mPPtZgd7dRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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