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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0156d3d290ff2ca41ac7090341a7d3e2ebe99205f760391a63ada7938499d7a2' 
  AND token = 'J6vVlEYmxWci0bn9YVqJZrs1CxY7s3bYurWU+p2nCpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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