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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2da32cedf064843dbebcabc8a66df01309ab01a082e6a2a0ff7ac5c5101f55fb' 
  AND token = 'WWeD/n0/0RhlNNqLnTGCk5nJMpAbRX+hMZJnro5Fj/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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