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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69bcba09c2867c9680bde6184817183044b926a23b91a23b5009b85d09dbf3de' 
  AND token = 'mBFGSRTMDbbvrRt9YRNpOU0568Y9qyNR/xbqiZXzRdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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