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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202393a5cf39ed22a360320aa35242db463cc2054be468902de3bac88f57d119' 
  AND token = '77w+EzX1jzWtIqSUTSWpKQrGb/A0s5JKiFlzpxv7ox0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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