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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da9661854315d77a9c7c556862d50185f0004bcd3e969475bc3e8770583dd213' 
  AND token = 'd4fxgQVO7LPpZFDTTa0rcWXfWcCgF1/xIRDWYwZLDDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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