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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32a9987f18117297bb8b0469ebbabf654d3df3f7dd2619a619e13cd90c1db7e6' 
  AND token = 'E9mxJDiJAIQ84Jc86XmgKUXCP/tM2X2/+r6N5+1Vu/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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